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  • 科学研究費補助金基盤研究(S)成果2009
  • 太陽電池・環境自然エネルギー寄付講座2006-2008

Welcome Tsurekawa Lab.

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Welcome Tsurekawa Lab.
EBSD image of a creep crack ( in black ) along prior austenite grain boundary
EBSD image of martensite microstructure in a heat-resistant power plant steel
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EBIC images showing grain boundary electrical activety in poly-Si in solar cells
KFM images showing grain boundary potential barrier in poly-Si in solar cells
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In-situ SEM/EBSD observation of abnormal grain growth in nano cristalline nickel
HRTEM image of grain boundarise in polycristalline silicon
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EBSD images showing crystallizatin from Fe-base soft-magnetic amorphous alloy in magnetic feild
Electron channeling pattern
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PFM micrographs for ferroelectric domain structure in Lead-free piezoelectric ceramics (LNKN)
IPF colored map of Fe2Al5 layer formed in aluminized steel

About our lab.

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Many of the materials around us are polycrystalline materials composed of many crystals or "grains". Grain boundaries are interfaces between two grains of different orientations, and their structures and properties depend on the crystal orientation relationship between the neighbouring grains. The properties of grain boundaries often control the physical properties of the entire polycrystalline material. One example of the importance of grain boundaries is the issue, recently in the news, of cracks in nuclear reactors. In many cases the cause is the the "stress corrosion cracking" phenomenon, which occurs preferentially along grain boundaries. Thus a phenomenon that occurs locally on a nanometre scale governs the performance and reliability of the entire structure. However, an important point is that all types of grain boundaries necessarily have the same effect and there are certain types at which stress corrosion cracking hardly occurs at all.

Similarly, in polycrystalline silicon solar cells, a key technology in the search for greener and cleaner energy, grain boundaries are one of the main causes of losses causing decreases in the conversion efficiency of sunlight to electrical energy, but it has been shown that not all grain boundaries contribute to this loss to the same extent. These two examples show that it is important to make the best use of the individual characteristics of grain boundaries to design and control materials properties. The research in our group takes as its basis grain boundary and interface science and engineering and the PMP triangle of 'Microstructure-Properties-Processing', with the aim of developing advanced materials with excellent function and performance.

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Topics

2014/2/20-3/4

Professor Victoria A. Yardley (Ruhr-Universität Bochum, Institut für Werkstoffe) stayed in our laboratory and delivered a special lecture titled as "Advanced EBSD analysis of materials microstructures: how to get the most out of your data".

2011/8/18

2010/2/19

2009/4/21-4/24

Profs. J. Cui , X. Zhao, C.Ban, and C. He (Key lab. of electromagnetic processing, Northeastern University (China)) visited our laboratory.

2009/2/1-3/31

Professor Boris B. Straumal (Institute of Solid State Physics,Russian Academy of Sciences) stayed in our laboratory under the JSPS Investigation Fellowship Program for Research in Japan.

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